Lifting-jack.



G. E. RIDER.

LIFTING JACK.

APPLICATION FILED APR. 17.1908.

Patented Jan. 19, 1909.

UNITED STATES PATENT GFICE.

GEORGE E. RIDER, OF KANSAS CITY, MISSOURI.

LIFTING-JACK.

To all whom it may concern:

Be it known that I, GEORGE E. RIDER, a citizen of the United States,residing at Kansas City, in the cotmty of Jackson and State of Missouri,have invented certain new and useful Improvements in Lifting-Jacks, ofwhich the following is a specification.

This invention relates to lifting jacks, and my object is to produce adevice of this character by which immense weights may be easily andreliably raised and lowered by a single operator.

A further object is to produce a device of this character of simple,strong, durable and cheap construction.

With these objects in view and others as hereinafter appear, theinvention consists in certain novel and peculiar features ofconstruction and organization as hereinafter described and claimed; andin order that it may be fully understood reference is to be had to theaccompanying drawing, in which Figure 1, is a front view of a liftingjack embodying my invention. Fig. 2, is a side elevation with the nearleg of the support broken away near its upper end and with the lever inits raised position. Fig. 3, is a central vertical section with thelever in its lowered position. Fig. 4, is a top plan view of the chainanchoring bracket.

In the said drawings, 1 indicates a U-shaped frame pivotally pendentfrom a bolt 2 upon which is mounted between the arms of the frame a hook3, for attachment to a suitable support.

4 indicates a bolt secured to the frame and journaled on said bolt is asheave 5 provided with a wide shallow groove 6 and a communicatingdeeper and narrower groove 7.

8 indicates an angle bracket receiving and secured to the lower end offrame 1, by bolt 9, the upright arm of said angle bracket being formedwith a wide shallow groove 10 and a communicating deeper and narrowergroove 11, said grooves respectively occupying the same vertical planeas grooves 6 and 7 of the sheave, and projecting from said bracket atthe opposite side from said grooves is a guide loop 12, secured in placepreferably, by the bolt 9.

13 indicates a swing frame of inverted-U form pivoted upon bolt 4between the sheave and the arms of frame 1. A lever comprises the handleportion 14 and the curved portion or head 16 projecting into the swingSpecification of Letters Patent.

Application filed April 17, 1908.

Patented Jan. 19, 1909.

Serial No. 427,732.

frame 13 and pivoted thereto as at 16, and pivoted to said lever at 17,near the pivotal point 16 is a bifurcated dog 18 formed with a recess 19in its inner end for engagement with certain links of a chain engagingsheave 5 and hanging pendently therefrom, said chain comprisingalternately arranged links 20 and 21, the former being disposed edgewiseto the sheave so as to be capable of fitting in the deep and narrowgroove 7 and the deep and narrow groove 11 of bracket 8, and links 21arranged flatwise with respect to the sheave and adapted to occupy thewide shallow groove 6 of the sheave and the wide shallow groove 10 ofthe bracket, the rear portion of the chain extending downward throughthe guide loop 12 and being equipped with lifting tongs 22, forengagement with the object to be lifted or the chain may be otherwiseconnected with the object.

The mechanism described may be suspended by hook 3 from any suitablesupport, that shown being of a character especially adapted for use inconnection with hay presses and being constructed as follows:-

23 indicates a pair of legs adapted to rest upon the ground and convergeupward when operatively disposed and secured at their upper ends asshown or otherwise to a pair of plates 24 which overlap at their innerends and are pivoted together at 25 and are provided in said overlappingends wit-h registering holes 26 to receive the hook 3, the pivotalconnection with plates 24 permitting the legs tobe folded together insubstantially a parallel relation when not in use, for convenience intransportation.

Assuming that the parts are in the posi tion shown in Fig. 2, and thatthe tongs are engaged with the object to be lifted, it will be noticedthat the upper end of one of the edgewise links is fitting in the recess19 in the inner end of the dog and that the front inner corner of saiddog is disposed between said link and the link next in advance and ispressing said links and the connecting flatwise link firmly against thesheave so that as the operator pulls downward upon the lever the chainmoves in the direct-ion indicated by the arrow, Fig. 2, from theposition shown in said figure to the position shown in Fig. 3. In suchoperation the rear portion of the chain travels upward through guideloop 12 which tends to restrain swinging movement of the object lifted,and it will be noticed that just before the termination of the fulldownward stroke of the lever, the fiatwise link passing through groove10 of the anchor bracket, is forced outwardly therein by the inclined orcam face of the lower end of said groove and that as such lever movementterminates said link clears the lower end of said bracket and swingsback under the narrow grooved portion of said bracket, the edgewise linknext above swinging back into the narrow groove to accommodate suchmovement so that the said underlying flatwise link shall be anchoredagainst upward or reverse movement and thus hold the object at theheight to which ithas been raised. The lever is then raised, this actionwithdrawing the dog from engagement with the chain, the dog fulcrumingat its rear corner upon the edgewise link partially occupying recess 19.As the lever is thus operated the swing frame 13 with the lever and dogswing rearwardly through frame 1 to their original positions and the dogassumes an operative relation to new links of the chain. By repeatingthe operations described the object can be lifted and sustained at thedesired height.

To lower an object supported by the tongs the lever is first disposedsubstantially as shown in Fig. 3 and while holding the same the operatorgrasps the pendent front portion of the chain and .pulls forward toeffect its release from the anchor bracket, and as this object isaccomplished he permits the lever to move upwardly under the weight ofthe descending object, the chain being released so that the nextflatwise link below that previously referred to will engage the anchorbracket in the manner described and sustain the object until the levercan be again lowered to the position shown in Fig. 3 preliminary to thenext lowering movement of the object, it being obvious that before eachof such operations of the lever, the front portion of the chain must bedisengaged from the anchor bracket because under its gravitativetendency each fiatwise link which passes through the grooved arm of theanchor bracket in either direction automatically acts to anchor thechain.

From the above description it will be apparent that I have produced alifting jack possessing the features of advantage enumerated and I wishit to be understood that I do not desire to be restricted to the exactdetails of construction shown and described as obvious modificationswill suggest themselves to one skilled in the art.

Having thus described. the invention what I claim as new and desire tosecure by Let ters-Patent, is

1. A lifting jack, comprising a suitably supported sheave having a widegroove and a communicating narrow groove, an anchor bracket suitablysupported below the sheave and provided with a wide groove and acommunicating narrow groove in the planes respectively of the wide andnarrow grooves of the sheave, and a chain engaging the sheave and theanchor bracket and consisting of edgewise links to engage the narrowgrooves of the sheave and bracket and flatwise links to engage the widegrooves of said sheave and bracket.

2. A lifting jack, comprising a suitably supported sheave having a widegroove and a communicating narrow groove, an anchor bracket suitablysupported below the sheave and provided with a wide groove andcommunicating narrow groove in the planes respectively of the wide andnarrow grooves. of the sheave, the base of the wide groove at its endremote from the sheave diverging outwardly from the base of the shallowgroove to increase the depth of the corresponding end of the latter, anda chain engaging the sheave and the anchor bracket and consistinguofedgewise links to engage the narrow grooves of the sheave and bracketand flatwise links to engage the wide grooves of said sheave andbracket; said flatwise links being adapted to underlie and bridge thedeepened end of the narrow groove of the bracket.

8. A lifting jack, comprising a suitably supported sheave having a widegroove and a communicating narrow groove, an anchor bracket suitablysupported below the sheave and provided with a wide groove-and acommunicating narrow groove in the planes respectively of the wide andnarrow grooves of the sheave, a chain engaging the sheave and the anchorbracket and consisting of edgewise links to engage the narrow grooves ofthe sheave and bracket and flatwise links to engage the wide grooves ofsaid sheave and bracket, and a guide loop underlying the groovedperiphery of the sheave at the opposite side of its axis from the grooveof the anchor bracket as a guide for the chain.

a. A lifting jack, comprising, a suitably supported sheave having a widegroove and a communicating narrow groove, an anchor bracket suitablysupported below the sheave and forth over the sheave, a lever pivoted tosaid frame, and a dog carried by said lever and adapted to project intothe space between contiguous edgewise links and clamp the chain firmlyagainst the sheave.

5. A lifting jack, comprising a suitably supported sheave having a widegroove and a communicating narrow groove, an anchor bracket suitablysupported below the sheave and provided with a wide groove and acommunicating narrow groove in the planes respectively of the wide andnarrow grooves of the sheave, a chain engaging the sheave and the anchorbracket and consisting of edgewise links to engage the narrow grooves ofthe sheave and bracket and fiatwise links to engage the wide grooves ofsaid sheave and bracket, a swing frame to swing back and forth over thesheave, a lever pivoted to said frame, and a dog carried by the leverand provided with a recess in its inner end to receive an end of one ofthe edgewise links and to clamp the same and the engaging fiatwise linkfirmly against the sheave.

6. A lifting jack, comprising a frame suitably supported, a sheavejournaled therein and provided with wide and narrow communicatinggrooves, the narrow groove being disposed inward and centrally of thewide groove, a bracket secured to the lower end of said frame andprovided with a substantially upright arm formed with a wide groove inthe vertical plane of the wide groove of the sheave, and a narrowcommunicating groove in the vertical plane of the narrow groove of thesheave, the base of the wide groove of said arm at its end most remotefrom the sheave sloping downwardly and forwardly and deepening thecorresponding end of the narrow groove, a chain engaging the sheave andarm of the bracket and consisting of edgewise links to engage the narrowgrooves of the sheave and arm and flatwise links to engage the widegrooves of the said sheave and arm of the bracket, a swing frame adaptedto swing back and forth through the first-named frame and pivoted at itslower end at opposite sides of and coincidently with the sheave, a leverpivoted within the swing frame, and a dog pivoted to and projectinginwardly from said lever and provided with a recess in its inner end toreceive a portion of either of the edgewise links while in engagementwith said sheave.

7. A lifting jack, comprising supporting legs, plates secured to theirupper ends, a hook suspended from said plates, a substantially-Ushapedframe pivotally suspended from said hook, a bolt connecting the arms ofthe frame, a grooved sheave journaled on said bolt, an anchor bracketsecured to the lower end of said frame and provided in the verticalplane of the groove of the sheave with communicating wide and narrowgrooves, a chain extending over the grooved sheave and hanging pendentlytherefrom at one side and extending through the grooved portion of thebracket and comprising edgewise links to snugly engage the narrow grooveof the bracket and fiatwise links to successively engage the wide grooveof the bracket, an inverted-U shaped swing frame to operate within thefirst-named frame and pivoted at its lower end upon said bolt atopposite sides of the sheave, and a dog pivoted to said lever andprovided with a recess in its inner end to engage one of the edgewiselinks of the chain to clamp the latter firmly against the sheave.

8. In a lifting jack, an anchor bracket having one arm provided withcommunicating wide and narrow grooves, the base of one end of the widegroove diverging with respect to the corresponding end of the narrowgroove to increase the depth of the latter at such end.

In testimony whereof I Zlil'lX my signature, in the presence of twowitnesses.

GEORGE E. RIDER.

lVitnesses H. C. Ronenns, G. Y. THORPE.

